@LaTableRouge Thank you for report, but your package.json link is 404 now. Your repo seems to update now. If you clear your issue, please tell us. Or not, please tell your package.json file.

@miminari I'm sorry I forgot that Github doesn’t handle links redirection....
I've updated the links on the first comments.
I still have an issue when compiling.

I made a separated branch with the error. It's more clean that way. I've edited the first message in this thread to redirect the links to the branch. :)

Help us move this issue forward. This issue is being marked stale since it has no activity after 15 days of requesting more information. Please add info requested so we can help move the issue forward. Note: The triage policy is to close stale issues that need more info and no response after 2 weeks.

I did reply and gave more informations.

Help us move this issue forward. This issue is being marked stale since it has no activity after 15 days of requesting more information. Please add info requested so we can help move the issue forward. Note: The triage policy is to close stale issues that need more info and no response after 2 weeks.

I did reply and gave more informations.

Hi, thank you for sharing.
OK, your package.json is so complex that I would test the simple one for multiple block building.

Steps

npx @wordpress/create-block test-block-bug
cd test-block-bug

2. Make files for 2 blocks in src dir like below:

├── src
│   ├── block01
│   │   ├── block.json
│   │   ├── edit.js
│   │   ├── editor.scss
│   │   ├── index.js
│   │   ├── save.js
│   │   ├── style.scss
│   │   └── view.js
│   └── block02
│       ├── block.json
│       ├── edit.js
│       ├── editor.scss
│       ├── index.js
│       ├── save.js
│       ├── style.scss
│       └── view.js

3. Update the title and name of the block.json files like below:

block01/block.json

"name": "create-block/test-block-bug",
"title": "Test Block Bug 01",

block02/block.json

"name": "create-block/test-block-bug2",
"title": "Test Block Bug 02",

4. Add and change the path to these blocks in the php file like below:

	register_block_type(__DIR__ . '/build/block01/');
	register_block_type(__DIR__ . '/build/block02/');

5. npm run build

6. You will get the message like webpack x.x.x compiled successfully in 000 ms

7. And you will see the blocks in the blocks list
   

8. Add some 3rd party package like recharts

npm install recharts

9. Update the two edit.js to use the package function like below:

import { LineChart, Line, CartesianGrid, XAxis, YAxis } from "recharts";
const data = [{ name: "Page A", uv: 400, pv: 2400, amt: 2400 }];

export default function Edit() {
	return (
		<LineChart width={600} height={300} data={data}>
			<Line type="monotone" dataKey="uv" stroke="#8884d8" />
			<CartesianGrid stroke="#ccc" />
			<XAxis dataKey="name" />
			<YAxis />
		</LineChart>
	);
}

10. Again npm run build and you can get new blocks like below:
    

As the docs explained like blew, you might not need to change the build command for building multiple block not customizing the dir.
https://developer.wordpress.org/block-editor/reference-guides/packages/packages-scripts/#automatic-block-json-detection-and-the-source-code-directory

I did the test by "@wordpress/scripts": "^30.2.0", so you might need to update the version.

I'm sorry that I don't know about the leaflet package very well, you might be better to ask about it in the package repo.
And I feel this is not Gutenberg issue, so would like to close this. But if there is anything I have missed, please feel free to comment.

Thanks a lot for your time.
I've done what you said and it works... So after all it's the library that I use that is poorly made and not some scope issue.
I'll try to recontact the author of the library.

Thanks again for your time